test: passing average_nb_photons option to backend.run() is not allowed

tests/local/test_backend.py

@@ -1,6 +1,7 @@
 from typing import List
 
 import numpy as np
+import pytest
 from qiskit import QuantumCircuit, transpile
 from qiskit.circuit.library import Initialize
 
@@ -43,6 +44,17 @@ def test_set_execution_backend_options() -> None:
     assert sum(backend.run(transpiled).result().get_counts().values()) == 7
 
 
+def test_run_override_nbar_error() -> None:
+    """
+    Test that passing average_nb_photons option to backend.run() is not allowed
+    """
+    circ = QuantumCircuit(1, 1)
+    backend = ProcessorSimulator(PhysicalCatProcessor())
+    transpiled = transpile(circ, backend)
+    with pytest.raises(ValueError):
+        _ = backend.run(transpiled, shots=100, average_nb_photons=4)
+
+
 def test_translation_plugin() -> None:
     backend = ProcessorSimulator(SimpleProcessor(1))